Weight-placing and vernier attachment



Jan. 3, 1928.

cs. G. VOLAND ET AL.

WEIGHT PLACING AND VERNIER ATTACHMENT Filed March 24, 1927 2 heets-Sheetl gvwemtow Jan. 3,1928.

GAG. VOLAND ET AL.

WEIGHT PLACING AND VERNIER ATTACHMENT Filed March 24, 1927 2Sheets-Sheet 2 Patented Jan. 3, 192&

UNITED STA,

1,555,118- ;PATENT OFFIQE.

GEORGE Gr. VOLAND AND EMIL L. VOLAND, OF NEW ROCHELLE, NEW YORK.

WEIGHT-PLACING AITD Application filed March 24, 192?.

The present invention relates to improvements in weight placing andvernier attachments for use particularly with analytical balances.

The present invention especially aims to improve the device shown in ourprior Patent, No. 1,301,765, dated April 22, 1919.

Among the principal objects which this invention has in View are: toprovide an attachment in which the balance member may be advanced on thescale beam by a sliding movement; to provide a Vernier for showing thefraction of a divisional space where the balancing member is placed inservice and a single means for operating the balance member and Vernier;to allow for lost motion between the operating means and balance memberand Vernier to insure against inaccuracies due to frictional engagementbetween the balance member and operating means; to provide a simplemeans for setting the scales at zero to correspond to the equilibriumposition of the balance member; and to simplify and facilitate thehandling of the scales.

In the drawings:

Figure 1 is a front view of a scale beam and weight placing and Vernier.attachment therefor;

Figure 2 is a perspective view of the balancing member showing themanner of disposing the same in service;

Figure 3 is a top plan view partly in section of the weight placing andVernier attachment;

Figure 4 is a front elevational view partly in section of theattachment.

Figure 5 is a bottom view of the attachment;

Figure 6 is a sectional view on line 66 of Figure 4;

Figure 7 is a sectional view on line 77 of Figure 4.

In the construction shown, the scale beam 10 is pivoted on a knife blade11 supported on a post 12. superposed on the scale beam is a slender rod13 of circular section which extends longitudinally of the scale beamand is detachably associated therewith by means of binding post 14:. Abalance member or weight 15 is slidably mounted on the rod 13 and tothis end the balance member which is in the form of a disk has aperforation 16, preferably triangular in shape and ofi'se from thecenter of the balance member through which perforaticn the rod 13VEENIER ATTACHMENT.

Serial No. 177,968.

tends. By means of this construction the weight of the balance memberserves to always maintain it centrally disposed on the rod 13 and in theposition shown in F igure 2.

The frame of the attachment is composed of two parts, 17 and 18, joinedtogether in some suitable manner. The part 18 serves as a support for ascale 19 calibrated to read in terms of weight. This scale is carriedadjustably attached to the part 18 by means of set screws 21, whichextend through slots 22 in the bar 20. The position of the sliding barand consequently of the scale 19 may be adjusted by an adjusting screw23 having a knurled head 24, the adjusting screw extending through anoliset portion 25 of the part 18 and having its end attached to anotheroifset portion 26 of the bar'20 as by means of a small screw 23% Thuswhen the adjusting screw 23 is rotated the bar 20 is caused to be movedlongitudinally so as to change and adjust the position of the scale 19with respect to the frame.

Below and contiguous the scale 19 is a vernier scale 27 supported by acarrier member 28 which has a tongue and groove connection with the part18 and also has a portion 29 which overlaps the top of the part 18. Thisvernier is disposed within a U shaped member 30 which is attached as bysoldering to a rack 31 slidably mounted in a longitudinal groove 32 inthe part 17 of the frame, and having projections 33 on its back facebearing against the part 18, to insure pure rectilinear motion of therack. The rack meshes with the pinion 34 which loosely encircles a post35 centrally disposed in a box portion 36 secured to the back of theattachment. The pinion has a bevel gear 37 integrally formed with it onits upper surface and meshing with another bevel gear 38 on the end of acircular rod 39. This rod is journaled between the box 36 and the cover40 therefor, said cover being detachably secured in place by means of ascrew 41 extending into the post 35. The rod 39 also extends throughanother bearing member 42 on the back of the attachment and has anenlarged knurled knob 43 on its end to serve as a finger means forrotating the rod.

Beneath the U shaped member there is disposed a bar 44 adjustablyattached to the U shaped member by means of set screws 4-5 which extendthrough slots 46 in the bar and. into the id shaped member; The bar carries two pairs of fingers 4C7 and 48 disposed on opposite sides of therod 13 and straddling the balance member 15. Ihe back pair of fingers"47 are rigidly attached to the" bar eta while the front pair 48am in theform of an inverted U with't'he'bight portion situated in a groove inthe bar 44, so as to permit tree pivotal movement'ot' the'fingers 4S.

7 Thet-wo legs of the U shaped memberBO have screws19 extending throughthem for the purpose of adjusting the position of the V ,vernier withinthe Ushaped member.- Stops 50 are also provided on the lower part of Ithe attachment to limit the extent of the lonrightfhand scalel; The knob 43 turned to cause the advancement of the U to lead to inaccuracies.

' gitudinal movement of the U sh'aped men'iber, llhe sestops may also beadjusted p In the, operation and use of the nventlon thevernier andbalance member 15 are first moved to the zero position. The article tobe weighted is' then placed in the left-hand pan as; seen in Figure 1and weights to the neaestieo' milligrams are placed in the s thenshapedmemberSO, and consequently ot the Ivernie r scale and the balancemember 15.

The weight advanced to the position at which the two pans balance and inthis position the eriact weight'of the article may be obtained byreading the scale 19 and the Vernier. 27. in order to prevent, anyinaccuracy the knob this turned back slightly before a reading is takenso that theffingers are withdrawn vfrom engagement withthe the readingson the scales at zero to correspond to the equilibrium point, that is,the

point atwhichthe'pans balance when there are no weights upon them'whatsoever.

.The result is obtained by moving 'the'balance member 15 to thatposition at which the scales balance and then by" turning the adjustmgscrew until the zero'on the scale'19.

coincides with the zero on the vernier'. All readings, therefore,are'taken from a zero and'it is not necessary to calibrate in order toallow for an initial zero reading, the weight being obtained directly bythe reading on the scales.

It will be apparent that many variations may be made in the constructionshown without departing from the spirit of the invention and we desireto be limited only by the state of the prior art and the scope of theappended claims.

Weclaim; I 7 n A J1 V -1. In a weighing scales, a scale beam alongitudinally extending therewith, a balance member slideablyj disposedon the rod and having a triangular, centrally oflset perforation for theaccommodation of the rod, and means for sli deably moving the balancemember along the rod, '2. In a weighing scales, ascale beam, a

a vbalance member associatediwith the beam. a U-shaped member'slideablysassociated with; the scale, a ver-nier disposed within theU-shaped member and adapted torlimitcd free movement therewithin,fingers carried by the U-shaped member and disposed on opposite sideslot-the balance member, and means for imparting movement to theoperating member. I V 3. In a weighing scales, a scale beam, a scalecalibrated to read'in terms of weight, a balance member associated withthe bean'i, a vernier, means for simultaneously moving the balancemember and vernier, and means for changingthe position of the scalewhereby the zero otithe scale coincides with the Zero of the Vernierwhen the balance member is in its equilibrium position. 1

et. In a weighing scales, a scale beam, a scale calibrated to'read interms of weight, a balance member associated with the beam, a Verniercooperating with the scale, and means for simultaneously moving thebalance member along the beam and thervernier along the scale, saidmeans permitting a limited amount of lost motion in operating thebalance member and Vernier.

rod, associated scale calibrated to read interms of weight,

- In testimony whereof, we have signedour names to this specificationthis 25 dayof February, 1927.

GEORGE e. voniN-n. Err-1L L. VOLAND. V

